Comment that's the R party fight, libertarian or establish (Score 4, Interesting) 218
I can certainly see why he runs as a Republican- the current fight is between the libertarian side of the party and the remnants of the Moral Majority faction and the establishment power base. The unfortunate fact is that libertarian party candidates don't get elected to the presidency and the senate, republicans do. He therefore can accomplish a lot more by getting elected as a Republican than he could by losing a Libertarian. President Reagan largely redefined the republican party in his own image, so there's no reason Rand Paul couldn't do the same.
Of course Reagan also developed an alliance with the Moral Majority crowd in order to get elected, and that alliance affected the party platform. Moral Majority officially shut down many years ago and people are fed up with the establishment power base, so the party is ripe to be redefined again.